Machine for tamping concrete



March 4 1924. 1,486,088

C. R. HARRY MACHINE FOR TAMPING CONCRETE File l 2'2. 192: 3 Sheets-Sheet 1 March 4, 1924.

-C. R. HARRY 'MACHINE FOR TAMPING CONCRETE Filed July 22 3 Sheets-'She et 2' Iii - wumnm m March 4, 1924.; 1,486,088

- C. RJH ARRY MACHINE FOR TAMPING CONCRETE Filed July 22, 1921 3 Sheets-Sheet 5 Patented Mar. 4, 1924.

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CHARLES R. HARRY, or raunnaroxrownfomo, ASSIGNOR TO THE J. B. roo'rn FOUNDRY COMPANY,.OF rannnmox'rown, OHIO, A CORPORATION or OHIO.

MACHINE FOR TAMPING CONCRETE.

Application filed July 22, 1921. Serial No. 486,792.

To all whom it may concern:

Be it known that I, CHARLES R. HARRY, a citizen of the United States, residing at Fredericktown, in the county of Knox and State of Ohio, have invented certain new and useful Improvements in Machines for Tamping Concrete, of which the following is a specification.

My invention relates to machines for tamping concrete in molds, particularly molds for making concrete blocks, although the machine is not limited in its functions to that particular purpose.

An object of my invention is to provide a machine of the character referred to which will be simple and economical in its construction and elfective in its operation.

Referring to the drawings Fig. 1 is a top plan of a machine embodying my improvements.

Fig. 2 is a side elevation of the same.

Fig. 3 is a view of the opposite side from that shown in Fig. 2.

Fig. 4 is an enlarged plan view of a portion of one of the lifter arms and its co-operating cam.

Fig. 5 is a side elevation of the same.

Fig. 6 is a front elevation of the machine.

Fig. 7 is an enlarged front view of a portion of the guide bars and one of the lifter plungers and its lifter arm.

Fi 8 is a section on the line 88 of Fig. 3.

' Fig. 9 is a section on the line 99 of Fig. 7

Referring to the drawings, a main supporting frame is provided consisting of four vertical legs 1, upper side rails 2, lower longitudinal connecting strips 3, and front and rear cross-straps 4 and 5. The frame thus constructed is braced by diagonal side strips 6 on both sides of the structure, similar diagonal strips 7 at the front and rear, and horizontally-extending diagonal strips 8 (Fig. 1) near the lower ends of the legs. The lower ends of the legs are connected to longitudinal base strips 9, which are extended forwardly a suitable distance and have their extensions connected by a sheet-metal floor 10.

The tampin g members are three in number in the present machine, each consisting of a plunger formed of two parallel bars 11, spaced apart and connected together by spacing blocks 12 and 13 and bolts 14 at their upper end and intermediate portion, and at their lower ends by the shanks 15 of tamping feet 16. The tamping members thus formed are slidably mounted between guide blocks 17, clamped between two parts of horizontal bars 18. v

The bars of onepair are connected to the bars of the other pair by vertical end standards 19, and further braced by the diagonal straps 20. ,This'rguide structure for the plunger 'is supported at the forward end of the main frame by brackets 21, to Which the side standards 19 are rigidly connected, the brackets being supported on the main frame through connections with blocks 22 and 23; the structure being further braced by strap 24 connecting the lower ends of the standards with the main frame.

Provision is made for consecutively raising and dropping the tamping members by means of cam operated lifter arms, each of which is formed of two parallel bars 25. The rear ends of the bars of each arm are connected to a crank arm, 26, mounted to oscillate on a rod 27 supported by the blocks 23, the crank arm having a plurality of points of attachment for the bars 25 for adjustment purposes. The forward ends of the bars 25 are connected to extensions 13 of the blocks 13 of the tamping members,

. by the bolt 28 (see Fig. 9).

Mounted to rotate in the bearings 23 is a cam-shaft 29, carrying a series of three cam fingers 30, one for each lifter arm; the high points of the cams being at the extreme ends of the fingers. The cam shaft is drawn from a main drive shaft 31 through the medium of sprocket-Wheels 32 and 33 and chain 34; the drive shaft having a pulley 35. Each pair of bars 25 has a roller 36 to co-operate with its corresponding cam-finger.

Extending beneath the series of lifter arm is a lifting rod 37 having a central crankshaped portion 37*. This rod is journaled in bearings 38 on the brackets 21 and one end thereof has a lever 39 provided with a weight 40.

Supported on the cross frame member 4 is an inclined chute 41, the lower end of which terminates adjacent the tamping members.

In order that the extent. of downward movement of the plungers relatively to the ings 26 so that the 1ifter ar1ns-25 may be" connected therewith at dififerent points.

The operation of the device is as follows:

Power being applied to the"pulley"35, the cam shaft 29 is rotated counterclockwise as viewed in Fig. 3. The cams being disposed equidistant about the shafit alternatively raise the' liiter arms and as soon as therol1s 36 reach the ends of thecams', the arms and plungers dropby gravlty. The mold is setbeneath the plunger-s upon the floor 10 and the concrete is fed: irom' any S111132Lbl6 source into the trough l so as to fall into the molds To 'facilitatethe placing. of the mold in position all of the lifter arms andtheir connected plungersmay be raised by depressing the l ver 39.- The plungers are limitedto theirdownward movement by the contact of the blocks 13 With the'cross-bars l8 and the extent to Which the feet 16 pro ject into the mold is varied by the different pointso'f attachment forthe plunger'ba'rs 11 to the blockslBl- Having. thus described my invention, I claim:

In a machine of the character described, a series of vertically movable plungers having tamping feet, a series of lifter arms, means for" adjn-stably connecting the for- Wardends of said" lifter arms 'to'said plungers, pivoted crank arms BOWlllOll the rear ends of said lifterarms are" adjustably con nected; and means-for alternately raising said fitting-armsand their connected plunge'rs and permitting them to drop-by gravity; In testimony whereofigl have hereunto set my handthis 19 day of July, 1921 CHARLES- R. HARRY;- 

